I am 32 and don’t have kids, so I have more spare time luckily — but the exhaustion for me was originally low iron (unlikely unless you have a vegan diet too), and low B12 (which is surprisingly common in people on non-vegan diets too!). Supplementing iron and drinking more (fortified, here in Aus) soy milk solved the exhaustion for me: if you haven’t had a blood test in a while to check some levels it might be worth looking into